Pump



Nov. 28, 1944- K. w. CROSSMAN PUMP Filed Au 26, 1945 3 Sheets-Sheet l WITNESSES: wm.

INVENTOR: WCr sman,

ATTORNEYS.

Nov. 28, 1944. K, w CROSSMAN 2,363,653

PUMP

Filed Aug. 26, 1945 3 Sheets-Sheet 2 WITNESSES: IN VEN TOR:

ATTORm.

NOV. 28, 1944. w CROSSMAN 2 ,363,653

PUMP

Filed Aug. 26, 1943 3 Sheets-Sheet 3 I, A, s

ATTORN S.

/ Renneiz WfCmssman M v- P E;

Patented Nov. 28, 1944 1 UNITED" STATE s, PATENT OFFICE rum Kenneth W. Crossman, Willow Grove, Pa; assignor to The Edwin H. Fltler 00.; Philadelphia, Pa., a corporation of Pennsylvania Application August 26, 1943; Serial No. 500,159

6 Claims.

This invention relates to pumps and has reference more especially to metering pumps of a-type designed to displace fluids in relatively small volume and at comparatively low pressures.

In connection with pumps of the kind referred to, I aim to attain, through improved and sim- Fig. 3 is a view in elevation looking as indicated 1 by the angled arrows III-III in Fig. 2 with portions of the pump casing broken away to expose important structural details within.'

Figs. 4 and 5 are sectional views taken as indi-. cated respectively by the angled arrows IV-IV and-V-V in Fig. 2.

Fig. 6 is a perspective view of the pump with one of the casing components removed."

Figs. 7 and 8 are perspective views of two disk As instanced in Fig. 2, each piston is provided with a pair of oppositely-cupped packing washers 21, 28 which are compressed and heldin place by a screw bolt 23. v

As shown in Fig. 2 the shaft I8 extends into the hollow 300! the supplementalhousing component I5, and splined to its protruding end for rotation therewith as at 3| is a valve disk 32 which bears'against the machined surface 33 of the wall 2| of the main housing component II forming the partition between the two hollows I3 and 30, said disk having its circumferential face fitting snugly against the annular wall 34 of said supplemental housing component.

32 hasa pair of arcuate slots 35 and 36 arranged in diametrically opposite relation. As shown the slots-35 and 36 are both concentric with the pump axis but at different radial distances therefrom for capacity to register alternately with cor- Y respondingly-spaced ports 38 and 33 which form elements which together constitute the valve means by which fluid flow within the pump is controlled.

As herein shown, my improved pump III has a main housing component with a hollow central annular portion II from which three cylinders I2 radiate, the hollow I3 of said component being closed by a removable screw-secured cover plate I4. The housing of the pump also comprises a dished supplemental component l5 which is likewise hollow and which has a projection circumferential flange I6 abutted against and screwsecured to a similar flange IT on the main component I I, the latter flange integrally uniting the cylinders I2. The drive shaft I8 of the pump extends axially -into the housing and is journaled in bearing openings I3 and 20 respectively in the wall 2| of the main housing component II and in the cover plate I4.

The cylinders I2 are closed at their outer ends by removable heads 22, and screw-plugs 23 in said heads serve as adjustable abutments for the outer ends of compression springs 24 which latter are influential in yieldingly' maintaining the pistons 25 in operative engagement with an eccentric actuating cam 26 aflixedto theshaft I8' within the hollow I3 of the main housing component I I. ,55

thetermini of passages 'or ducts 40 extending from the outer ends of the respective cylinders l2. Bearing against the rotary disk 32 is a somewhat thicker non-rotating backing disk 4i 'which is centrally apertured to fit over an axial boss projection 42 on said rotary disk and which like the latter has a snug circumferential fit within the hollow 30 of the supplemental housing component I5. As shown in Figs. 3 and 8, the nonrotating disk 4| is moreover provided in its inner face with 'arcuate grooves 43 and 44 which are,

disposed in diametrically opposite relation like the slots in the rotary disk 32 for capacity to alternately register therewith during the operation of the pump. At their corresponding ends the grooves 43 and 44 communicate with ports 45 and 43 having lateral branches 41 and 43 which are internally'threaded for reception respectively of outflow and inflow pipes 49 and 5 0 through which fluid is conducted to and away from the pump. The springs indicated at 5| in Fig. 2 are relied upon to maintain the non-rotating backing disk 4| yieldingly in engagement with the rotary disk 32; and in order that said nonrotating disk may have free axial play within the hollow 30 of the supplemental housing component IS, the circumferential wall of the latter is formed with liberal clearance slots 52 (see Fig. 2) for passage of the outflow and inflow pipes 49 and 50. Gaskets 53 and 54 interposed between'the housing parts insure liquid-tight joints at the regions of mutual abutment of these parts. In order that the pump may be conveniently mounted upon or secured to the machine or apparatus with From- Figs. 5 and '7 it will be noted that the rotary disk out the necessity for further illustration. In Fig.

- disk, said non-rotating disk having a pair of 5, the rotary valve disk 32 is shown in the posi- I tion which it occupies when the cam 26 is positioned as in Fig. 4 with the shaft rotating clockwise. At this moment the piston 25 at the lower left-hand side of Fig. 4 is moving inward of its cylinder l2 and forcing liquid by way of the passage 40 and port 38, the now registering arcuate slots 35 and 43 respectively of the disks 32 and 4|, the port 45 and the passage 41, into the outflow ipe 49. At the same instant the piston 25 at the upper left-hand portion of Fig. 4 is moving outward of its cylinder I2 and drawing in liquid from the inflow pipe 5|! via the corresponding passage 40 and port 39, the now registering arcuate slots 36 and 44 of the disks 32 and 4|, and the port 46. The piston 25 in the cylinder |2 at the right-hand side of Fig. 4 is at the moment quiescent with both of the ports 38 and 39 of the corresponding passage 40 covered by the blank portion of the disk 32 between thecontiguous ends of the arcuate slots 35 and 36 of said disk. Accordingly during each rotation of the shaft 8 a charge of the fluid being pumped is .drawn into and expelled from each'cylinder l2, the directional flow within the pump being controlled through cooperation between the rotary and stationary disks 32 and 4| whereof the arcuate passages 35, 36 and 43, 44 are so proportioned in circumferential length as to insure continuouadisplacement of the fluid at a constant pressure and rate. Due to the snug circumfer-,

ential fit of the disks 32 and 4| within the suppleinental housing component l5, and the pressure contact maintained between them and between the disk 32 and the surface 33 of the main housing component II, by the springs 5|, the likelihood of fluid leakage to the exterior is effectively precluded. The springs 5| also serve to take up the wear of the disks 32 and 4|, since the latter have the capacity to shift axially on the drive shaft N! as already explained.

From the foregoing it will thus be seen, my

' improved pump is not only simple in construction but reliable in operation, and moreover so designed thatit can be readily and quickly disassembled in the event inspection or replacement of any of its parts should become necessary after long periods ofcontinuous service.

Having thus described my invention, I claim: 1. In a pump, a housing with a partition setting apart two coaxial juxtaposed annular hol- .lows; a cylinder extending laterally from the housing; a piston within the cylinder; a drive shaft journaled axially of the housing and provided with means within one hollow of' the hous-,

ing for reciprocating the piston; a fluid inlet and a fluid outlet for the pump; and means for controlling fluid flow within the pump including a passageway which leads from the outerend of the cylinder in the partition to a pair of radially-spaced ports open at that surface of the partition exposed within the other .hollow of the housing, and a pair of valve disks within tie last mentioned hollow, one mounted on the lit bear against said surface and having a pairof concentric arcuate slots arranged in diconcentric diametrically-opposed grooves coincident with the slots of the rotary disk, and ports leading from said grooves respectively tothe fluid boss projection on the rotary disk; and wherein a yielding means serves to maintain fluid-tight ness between the non-rotating and the rotary disk as well, as between the latter disk and the surface of the partition which it abuts.

3. A pump according to claim 1, wherein the rotary disk is connected to the shaft with freedom for axial movement thereon; wherein the non-rotating disk has a sliding fit on an axial boss projection on the rotary disk; and wherein a yielding means serves to maintain fluid-tightness between, the non-rotating and the rotary disk as well as between the latter disk and the surface of the partition which it abuts; wherein the fluid inlet and fluid outlet are formed in. the non-rotating disk at the edge thereof; wherein inflow and outflow pipes are connected to said inlet and outlet; and wherein the pump housing is provided with clearance slots through which the inflow and outflow pipes pass.

4. In a pump, a housing; a cylinder with a closed outer end connected to the housing; a piston within the cylinder, a drive shaft with bearing in the housing and having means thereon for actuating the piston; a fluid inlet and a fluid outlet for the pump; and means for controlling fluid flow within the pump including a passage leading through a wall of the housing from the outer end of the cylinder to a pair of radially spaced ports in concentric relation to the shaft and open atone side face of the housing wall, and a pair of valve disks, one mounted on the shaft to bear against said wall face and having a pair of concentric arcuate slots in diametrically opposite relation for registry alternately with said ports, and the other disk being nonrotative and bearing against the rotary disk, said non-rotating disk having a pair of concentric diametrically-opposed grooves coincident with the slots of the rotary disk, and ports leading from said grooves respectively to the fluid inlet and the fluid outlet of the pump.

5. A pump according to claim 4, wherein the rotary disk is connected to the shaft with freedom for axial movement thereon; wherein the non-rotating disk has a sliding fit on an axial boss projection of the rotary disk; and wherein a yielding means servesto maintain fluid-tightness between the non-rQtating and the rotary disk as well as between the latter disk and the contiguous face of the housing wall. 

